Cassini has sighted Prometheus and Pandora, the two F-ring-shepherding moons whose unpredictable orbits both fascinate scientists and wreak havoc on the F ring. Prometheus (102 kilometers, or 63 miles ...

Prometheus is caught in the act of creating gores and streamers in the F ring. Scientists believe that Prometheus and its partner-moon Pandora are responsible for much of the structure in the F ring.

Images of Saturn’s narrow and contorted F ring returned by cameras onboard NASA’s Cassini spacecraft have revealed phenomena not previously detected in any planetary ring. The findings are reported in ...

image: These views, taken two hours apart, demonstrate the dramatic variability in the structure of Saturn's intriguing F ring. In the image at left, ringlets in the F ring and Encke Gap display ...

A pair of moons, Pandora and Prometheus, continue their shepherding duties near Saturn’s thin F ring. Pandora (81 kilometers, or 50 miles across) orbits outside the F ring and, with the inner shepherd ...